παιδια, η πατεντα σε αλλους που το δοκιμασανε δεν επιασε... τεσπα, εδω ειναι, την ειχα κανει ποστ και στο site της rme:
make sure you uninstalled both fireface mixer and settings apps, before you proceed & that in the audio settings in system preferences is the iMac's in/out as default.
1. connect ff400 with the iMac fw400 port, using the simple cable you already had.
2. open iMac.
3. install the drivers (i made it work only with the old drivers, that are included in the original disk)
4. restart, as is required.
5. run flash update tool, even if it is up-to-date (the one included in the original disk).
6. switch off ff400 (βγαλτε το fw απο πισω), as is required & at the same time, move fireface_settings.gz app to the trash.
7. switch on ff400 (ξαναβαλτε το fw cable), empty trash (fully delete fireface_settings.gz) & restart iMac.
NOW IT WORKS!!! no more glitches, just the perfect sound that rme is used to offer..